package collection;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

public class SortInteger {
    public static void main(String[] args) {
        Random rand = new Random();
        List<Integer> list = new ArrayList<>();
        for (int i = 0;i<10;i++){
            list.add(rand.nextInt(100));
        }
        System.out.println(list);
        Collections.sort(list);
        System.out.println("排序后："+list);//自然排序---小到大
        Collections.reverse(list);
        System.out.println("反转后："+list);  //反转list集合(数据已经变了---大到小)
        System.out.println("第一个元素："+list.get(0));
    }
}
